摘要
为了解榄仁树(Terminalia catappa)的生理生态特性,对西沙群岛永兴岛上自然生长的榄仁树的叶片形态、生理特征、营养元素含量以及根际土壤特征进行了研究。结果表明,榄仁树具有比叶面积低、叶片厚、气孔密度小等形态特征。叶绿素a/b为2.25∶1,低于理论值3∶1。叶片的SOD和POD活性较低,脯氨酸和ABA含量较高。植物体内养分含量较高,适生土壤养分含量低。这说明榄仁树叶片的吸收利用光能能力较强,保水能力较好,有较强的抗干旱和抗逆能力,适生于贫瘠的土壤并保持较高的叶片营养。因此,榄仁树是一种能够适应高温、干旱、贫瘠等恶劣生境条件的树种,可作为热带珊瑚岛植被恢复的工具种和园林绿化树种。
In order to understand the eco-physiological characters of Terminalia catappa, its leaf morphology, physiology, nutrient element contents and the rhizosphere soil characteristics were studied grown in Yongxing Island, Xisha Islands. The results showed that T. catappa had low specific leaf area, thick leaf thickness and low stomatal density. The chlorophyll a/b(2.25∶1) was lower than theoretic value(3∶1). The SOD and POD activities in leaves were low, but proline and abscisic acid contents were high. The nutrient element contents in leaves were high, but the suitable soil nutrient content was low. It indicated that the leaves of T. catappa had high light energy absorptivity, good water holding capacity, and high drought tolerance, thus it was suitable to grow in poor soil conditions and maintain high leaf nutrition levels. Overall, T. catappa can tolerate high temperature, drought and barren soil and can be used as a tool and landscaping species for vegetation restoration on tropical coral island.
出处
《热带亚热带植物学报》
CAS
CSCD
北大核心
2018年第1期40-46,共7页
Journal of Tropical and Subtropical Botany
基金
国家重点研发计划项目(2016YFC1403002)
中国科学院A类战略性先导科技专项(XDA13020500)
“十二五”农村领域国家科技计划项目(2015BAL04B04)
广东省科技计划项目(2016A030303044)资助
关键词
榄仁树
形态
生理生态
养分含量
Terminalia catappa
Morphological anatomy
Eco-physiology
Nutrient content